The geology of the south Wales coalfield. Part II, The country around Abergavenny, memoir for 1:50 000 geological sheet 232 (England and Wales) / W. J. Barclay ; contributors, stratigraphy and structure D. I. Jackson ; paleontology M. Mitchell, B. Owens, N. J. Riley, D. E. White ; petrography G. E. Strong ; hydrogeology R. A. Monkhouse. - 3rd ed.Books/Monographs
